Read this page. These are the two main concepts you need to understand after reading this article:

- how to identify whether a pair of numbers is a solution of a given equation or inequality in two variables; and
- if you graph all solutions (ordered pairs of numbers) of a linear equation in two variables on a coordinate plane, they will create a straight line.

Practice applying these concepts by clicking on the "new problem" button at the end of the article, trying a problem, and checking your answer. Attempt to solve 10 problems. You can also create a worksheet of 10 problems by clicking on the button at the bottom of the page titled "Click Here for a Randomly Generated Worksheet and Answers." The answers will be provided at the end of the worksheet.

Click http://www.onemathematicalcat.org/algebra_book/online_problems/eq_two_vars.htm link to open resource.